package com.changgou.search.service.serviceImpl;

import com.alibaba.fastjson.JSON;
import com.changgou.search.service.SearchService;
import com.sun.org.apache.bcel.internal.generic.IF_ACMPEQ;
import org.apache.commons.lang.StringUtils;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.Operator;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.reindex.ScrollableHitSource;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.terms.StringTerms;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortBuilders;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.elasticsearch.core.ElasticsearchTemplate;
import org.springframework.data.elasticsearch.core.SearchResultMapper;
import org.springframework.data.elasticsearch.core.aggregation.AggregatedPage;
import org.springframework.data.elasticsearch.core.aggregation.impl.AggregatedPageImpl;
import org.springframework.data.elasticsearch.core.query.NativeSearchQueryBuilder;
import org.springframework.data.elasticsearch.core.query.SearchQuery;
import org.springframework.stereotype.Repository;
import org.springframework.stereotype.Service;
import search.pojo.SkuInfo;

import java.util.*;
import java.util.stream.Collectors;

@Service
@Repository
public class SearchServiceImpl implements SearchService {
    @Autowired
    private ElasticsearchTemplate elasticsearchTemplate;

    @Override
    public Map search(Map<String, String> searchMap) {
        Map<String, Object> resultMap = new HashMap<>();
        //构建查询
        if (searchMap != null) {
//            条件构建对象
            NativeSearchQueryBuilder nativeSearchQueryBuilder = new NativeSearchQueryBuilder();
            BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
            //按照关键字查询
            if (!StringUtils.isEmpty(searchMap.get("keywords"))) {
                boolQuery.must(QueryBuilders.matchQuery("name", searchMap.get("keywords")).operator(Operator.AND));
            }
            //按照品牌进行过滤查询
            if (StringUtils.isNotEmpty(searchMap.get("brand"))) {
                boolQuery.must(QueryBuilders.matchQuery("brandName", searchMap.get("brand")));
            }

             //按照规格进行过滤查询
            for (String key :searchMap.keySet()){
                if (key.startsWith("spec_")){
                    String value = searchMap.get(key).replace("%2B", "+");
                    //spec_网络制式
                    boolQuery.must(QueryBuilders.matchQuery("specMap."+key.substring(5)+".keyword",value));
                }
            }

            //按照价格进行区间过滤查询
            if (StringUtils.isNotEmpty(searchMap.get("price"))){
                String[] prices = searchMap.get("price").split("-");
                if (prices.length==2){
                    //小于等于第二个元素
                    boolQuery.filter(QueryBuilders.rangeQuery("price").lte(prices[1]));
                }
                //大于等于第一个元素
                boolQuery.filter(QueryBuilders.rangeQuery("price").gte(prices[0]));
            }

            nativeSearchQueryBuilder.withQuery(boolQuery);

            //按照品牌进行分组查询，聚合查询
            String skuBrand = "skuBrnd";
            nativeSearchQueryBuilder.addAggregation(AggregationBuilders.terms(skuBrand).field("brandName"));

            //按照规格进行聚合查询
            String skuSpec="skuSpec";
            nativeSearchQueryBuilder.addAggregation(AggregationBuilders.terms(skuSpec).field("spec.keyword"));

             //分页
            String pageNum=searchMap.get("pageNum");//当前页
            String pageSize=searchMap.get("pageSize");//每页显示的条数
            if (StringUtils.isEmpty(pageNum)){
                pageNum="1";
            }
            if (StringUtils.isEmpty(pageSize)){
                pageSize="30";
            }
            //设置分页
            //参数一 当前页  从零开始
            // 参数二 每页显示条数
            nativeSearchQueryBuilder.withPageable(PageRequest.of(Integer.parseInt(pageNum)-1,Integer.parseInt(pageSize)));

            //按照相关字段进行排序查询
            // 1 当前域 2 排序方式
            if (StringUtils.isNotEmpty(searchMap.get("sortField"))&&StringUtils.isNotEmpty(searchMap.get("sortRule"))){
                if ("ASC".equals(searchMap.get("sortRule"))){
                    nativeSearchQueryBuilder.withSort(SortBuilders.fieldSort(searchMap.get("sortField")).order(SortOrder.ASC));
                }else {
                    nativeSearchQueryBuilder.withSort(SortBuilders.fieldSort(searchMap.get("sortField")).order(SortOrder.DESC));

                }
            }

              //设置高亮域以及高亮样式
            HighlightBuilder.Field field=new HighlightBuilder.Field("name")//高亮域
                    .preTags("<span style='color:red'>")//高亮样式前缀
                    .postTags("</span>");//高亮样式后缀
            nativeSearchQueryBuilder.withHighlightFields(field);

            /**
             * 参数一 条件构建对象
             * 参数二 查询操作实体类
             * 参数三 查询结果操作对象
             */
            AggregatedPage<SkuInfo> skuInfos = elasticsearchTemplate.queryForPage(nativeSearchQueryBuilder.build(), SkuInfo.class, new SearchResultMapper() {
                @Override
                public <T> AggregatedPage<T> mapResults(SearchResponse searchResponse, Class<T> aClass, Pageable pageable) {
                    //查询结果的操作
                    List<T> list = new ArrayList<>();
                    //获取查询命中结果数据
                    SearchHits hits = searchResponse.getHits();
                    if (hits != null) {
                        for (SearchHit hit : hits) {
                            //SearchHit转换为skuinfo
//                            String jsonString = JSON.toJSONString(hit);
//                            SkuInfo skuInfo = JSON.parseObject(jsonString, SkuInfo.class);
                            SkuInfo skuInfo = JSON.parseObject(hit.getSourceAsString(), SkuInfo.class);

                            Map<String, HighlightField> highlightFields = hit.getHighlightFields();
                            if (highlightFields!=null&&highlightFields.size()>0){
                                //替换数据
                                skuInfo.setName(highlightFields.get("name").getFragments()[0].toString());
                            }


                            list.add((T) skuInfo);
                        }
                    }
                    return new AggregatedPageImpl<T>(list, pageable, hits.getTotalHits(), searchResponse.getAggregations());
                }
            });
            //封装查询结果
            //总记录数
            resultMap.put("total", skuInfos.getTotalElements());
            //总页数
            resultMap.put("totalPage", skuInfos.getTotalPages());
            //数据集合
            resultMap.put("rows", skuInfos.getContent());

            //封装品牌的分组结果
            StringTerms brandTerms = (StringTerms) skuInfos.getAggregation(skuBrand);
            List<String> brandList = brandTerms.getBuckets().stream().map(bucket -> bucket.getKeyAsString()).collect(Collectors.toList());
            resultMap.put("brandList", brandList);

            //封装规格分组结果
           StringTerms skuSpecTerms=(StringTerms) skuInfos.getAggregation(skuSpec);
            List<String> specList = skuSpecTerms.getBuckets().stream().map(bucket -> bucket.getKeyAsString()).collect(Collectors.toList());
            resultMap.put("specList",this.formartSpec(specList));

            //封装当前页
            resultMap.put("pageNum",pageNum);

            return resultMap;
        }

        return null;
    }

    public Map<String, Set<String>> formartSpec(List<String> specList){
        Map<String,Set<String>> resultMap=new HashMap<>();
        if (specList!=null&&specList.size()>0){
            for (String specJsonString:specList){
                //将json数据转换成map
                Map<String,String> specMap=JSON.parseObject(specJsonString,Map.class);
                for (String specKey:specMap.keySet()){
                    Set<String> specSet=resultMap.get(specKey);
                    if (specSet==null){
                        specSet=new HashSet<String>();
                    }
                    //将规格的值放入set中
                    specSet.add(specMap.get(specKey));
                    //将set放入map中
                    resultMap.put(specKey,specSet);
                }
            }
        }
        return resultMap;
    }
}
